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Following script are very useful to know all the constraint in the database. I use this many times to check the foreign key and primary key constraint in database. This is simple but useful script from my personal archive.

SELECT OBJECT_NAME(OBJECT_ID) AS NameofConstraint, SCHEMA_NAME(schema_id) AS SchemaName, OBJECT_NAME(parent_object_id) AS TableName, type_desc AS ConstraintType FROM sys.objects WHERE type_desc LIKE '%CONSTRAINT'